But some physicians wonder how clean the procedure can actually be.
但是，一些内科医生仍对该手术方法的实际清洁程度持怀疑态度。
Mom:Yes. And how clean the air is!
是的。而且空气是多么清新呀！
My classmates have already cleaned our classroom, look, how clean it is!
同学们已经把教室打扫干净了，瞧，多干净啦！
The only noticeable evidence of its presence is how clean the floors are.
你只有在回家发现地板光洁一新后才会意识到这位田螺姑娘的存在。
I mean, how clean can teeth get?
我指牙齿能有多干净？
But how clean is the water in the average backyard or public pool?
但是在一般的后院和游泳池的水有多清洁呢？
水有多干净呢？
How clean is that doggy in the window!
看窗子后头的狗狗多干净啊！
How clean is that doggy in the window!
看窗子后头的狗狗多干净啊！
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